Date: Tue, 29 Mar 2005 01:25:57 -0500 From: "hippo" <johnhnospamam.shoal.net.au> Subject: Re: occasional use of high octane petrol
Craig wrote: >>> APC was only fitted to Saab 8V 900's with turbo-equipped engines as far as >>> I'm aware. The ones that didn't have turbo's (such as mine) don't have >>>APC. >>> I think APC was a standard part of the equipment for 900's with 16V >>>engines >>> regardless of whether they had a turbo or not, but I'm open to >>> clarification. >>APC works by controlling the turbo boost pressure and allowing it to go as >>high as it can before detonation occurs. Only turbo cars had APC, without >>the turbo there's nothing for the APC to control. >Good point - didn't think of that straight off. 8-) >>The other 16v engines do have knock sensors, but it controls the ignition >>timing only. >Ah ok thanks for clarifying that James - appreciate your input. >Regards, >Craig. AFAIK, all turbo engines had hardened valve seats from the beginning, I know my 83T does. That means none of the turbos need additives. So you can safely run PULP on pre APC turbos and 92 ULP on any APC models (which IIRC accept anything over 79RON or some such ridiculous figure). I'd still run premium in any non turbo and probably run flashlube or similar if it's a longterm proposition. If you've already planned for a rebuild or disposing of the car within the next two years, then save the extra money! Cheers
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